LetJevDecide
Web app for yes/no life decisions: ask Jev for a probability of yes, flip a fair coin, or both, inspired by a coin-toss study.
Overview
Let Jev Decide is a small website for people stuck on a yes-or-no decision. You type the question, optionally add details, and either ask Jev, flip a fair coin made in the browser with cryptographic randomness, or do both and see whether they agree. Jev returns yes or no, the probability of yes and how big a decision it thinks this is. The coin supports one flip or best of three.
The idea comes from Steven Levitt's field experiment in which people let a coin decide major life choices; those who got heads were about 25 points more likely to make the change, and for important decisions, making the change was associated with greater happiness six months later, though Levitt called the results merely suggestive. The site adds Jev as a second decider whose answer depends on what you tell it. One request asks Jev four questions in parallel through a relay. There is no sign-up or install, and the site states it is for fun, not professional advice.
What the decision model decides
| Type | Question | Answers |
|---|---|---|
| Yes / no | Should you make this change? (probability of yes) | — |
| Score | How big a decision is this? | — |
How it works
- User types a yes/no decision and optional details
- Relay sends four questions to Jev in one request
- Site shows yes or no, probability and decision size
- Optionally flip a fair coin and compare
Strengths
- No sign-up or install
- Grounded in a published study
- Shows probability rather than a bare verdict
Caveats
- For fun, not professional advice
- Jev's answer depends on how the question is phrased
- Requires the hosted relay
Getting started
Use it at https://choxos.github.io/LetJevDecide/.At a glance
- Type
- Project
- Status
- prototype
- Language
- JavaScript
- Runtime
- static site with relay
- Has code
- yes
Use cases and integrations
How curated lists describe it
Ask a yes or no question. Let Jev, or a fair coin, decide.
hellogumbo/awesome-jev
Frequently asked questions
What does Jev decide?
Yes or no on your question, with the probability of yes and how big the decision is.
Is the coin truly random?
It uses the browser's crypto.getRandomValues.
Should I follow its advice?
The site says it is for fun, not professional advice.
Related projects
Public Jev playground showing a scheduling Choice with an explicit Unresolved option to separate mentioned times from agreed meeting times.
AppAwesome list and guide to System One models (Jev, Laya and others) organized around a five-stage agent lifecycle, with comparison tables.
ProjectproductionOpinionated catalog of 84 Jev projects in 11 categories, each with a hand-written reason it is worth looking at.
ProjectproductionUnofficial collection of Jev state formats, question patterns, cookbook index and case studies, plus a ranked Top 30 of community builds.
ProjectproductionBilingual catalogue of 183 Jev applications in 11 categories, explaining how each works and what its demo actually proves.
ProjectproductionKorean course code for attaching Jev to Claude Code, Codex and OpenClaw: skills, hooks, routers and open-model comparisons.
ProjectproductionJavaScript